mechanical fuel pump question

Is your fuel tank pick up upgraded to 3/8"? Are you running -6 or 3/8" line from pump to carb? If not, then I would just use the stock pump until you upgrade the rest of the fuel system. Use a Union Reducer, 1/4 x 3/8 tube size.

View attachment reducer.jpg

If you have upgraded the system, then the Edelbrock 1720 pump has 3/8" NPT inlet and outlet and maintains 6 PSI. http://www.summitracing.com/parts/edl-1720/overview/make/dodge. This is the pump that I used.

Also, just fyi, the Carter 6902 only has 1/4" inlet/outlet (according to Mancini) http://chucker54.stores.yahoo.net/cam6sumefupu.html